Question 912853
Cross multiply,
{{{b(x+3)=a(x-3)}}}
{{{bx+3b=ax-3a}}}
{{{bx-ax=-3a-3b}}}
{{{(b-a)x=-3(b+a)}}}
{{{x=-3((b+a)/(b-a))}}}
{{{x=3((a+b)/(a-b))}}}